Aluminium oxide

<p>Aluminium oxide (or aluminium(III) oxide) is a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> of <a href="/facts/Aluminium/7wmR8jYE">aluminium</a> and <a href="/facts/Oxygen/acyn6o8r">oxygen</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> Al2O3. It is the most commonly occurring of several <a href="/facts/Aluminium_oxide_(compounds)/RHCI8wLI">aluminium oxides</a>, and specifically identified as aluminium oxide. It is commonly called alumina and may also be called aloxide, aloxite, or alundum in various forms and applications. It occurs naturally in its crystalline <a href="/facts/Polymorphism_(materials_science)/bu2tqsB9">polymorphic</a> <a href="/facts/Phase_(matter)/NkHXDdN3">phase</a> α-Al2O3 as the <a href="/facts/Mineral/LkUFbNmv">mineral</a> <a href="/facts/Corundum/B7RRbcaE">corundum</a>, varieties of which form the precious <a href="/facts/Gemstone/kHffmvE3">gemstones</a> <a href="/facts/Ruby/faGnqzW8">ruby</a> and <a href="/facts/Sapphire/C11GJAmm">sapphire</a>.  Al2O3 is used as feedstock to produce aluminium metal, as an <a href="/facts/Abrasive/UJ9TvVMx">abrasive</a> owing to its <a href="/facts/Hardness/PtGn6E20">hardness</a>, and as a <a href="/facts/Refractory/LoKrzGkR">refractory</a> material owing to its high melting point.
</p>

Aluminium oxide open-in-new

Aluminium oxide